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-   -   roof ventilation (http://www.diychatroom.com/f9/roof-ventilation-184198/)

bgigacz 07-24-2013 08:45 PM

roof ventilation
 
I have a ventilation question. My attic is approx 1000sq feet. I have two gable vents that are approx 1 sq foot each. Now I understand that this is not enough ventilation and I have since put in two additional roofs vent. Now I have not noticed any difference and the ceiling is still warm. Should I close off the gable vents? My thoughs are that the cooler air is getting sucked in the the gables and not the soffit and out the roof vents in turn not ventilating the attic.

PoleCat 07-25-2013 06:44 AM

No venting statagy will ever make your attic comfortable. The main purpose is to release moisture and extreme heat. Heat rises so it will find a way out the roof or gable vents as the path of least resistance.

joecaption 07-25-2013 07:13 AM

For the best advice we need your location in your profile, go to Quick links to edit.
In most cases you would have been far better off using a ridge vent not a roof or gable vent so the whole roof gets vented and none stays trapped in the rafter bays.
Any form of roof vent also needs an equal amount of soffit venting.
If not it would be like sucking on a straw with your finger over the tip.
Making sure there's enough insulation, making sure the soffits are not blocked with insulation play a big part in a total system.

bgigacz 07-25-2013 07:40 AM

I can't find were to edit my profile. I live in Petawawa, Ontario.
I have a working soffit all the way around the house, the trouse baffles are clear of obstructions and working. I have about 12" of blown insulation. I am going to take the low profile vents off and will reinstall the maximum vents. I am just wondering if I should close off the gable vents as that would be the path of lease resistance and the air may not be getting sucked up through tue soffits.

PoleCat 07-25-2013 07:47 AM

12" sounds like not enough for anywhere in this hemishere.:huh:

joecaption 07-25-2013 08:18 AM

http://www.airvent.com/homeowner/pro...dgeVents.shtml
Do not use the type that comes on a roll!
They just do not supply enough air flow.
Any box store or roofing supply will stock ridge vents.
And your right all the other vents you now have need to be blocked off or it will make all the soffit and ridge vents useless.

frankm1960 07-25-2013 11:01 AM

Check out this link for attic ventilation... the table at the bottom I found useful. It gives some recommendations based on attic square footage. They indicate exhaust flow at the attic vents should equal intake flow at the sofit.

http://www.gaf.com/Roofing/Residenti...a_Rigid_Vent_3

747 07-26-2013 08:24 AM

Slap one solar exhaust vent in the middle back of roof. Close off the gables.

PAHome 08-05-2013 02:00 PM

I believe a baffled ridge-vents are the most efficient, you will need to close up the gable vents. I use the shingle-vent II by Air Vent.


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